US1629877A

US1629877A - lincoln

Info

Publication number: US1629877A
Authority: US
Publication date: 1927-05-24
Anticipated expiration: 1944-05-24

Description

' 1,62, May 24,1927. J. FJUNCOLN 9877 FRAME FOR DYNAMO ELECTRIC MACHINES Filed May 5, 1924 7 1 INVENTOR.

' Jimas 1. L limo/z? d ATTORNEYS Patented May 24, 1927.

UNITED STATES JAMES PATENT OFFICE,

n. LINcoLn, on CLEVELA D onro, ASSIGNOR TO THE LINCOLN ELECTRIC oom- IPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FRAME FOR DYNAMIC-ELECTRIC MACHINES.

Application filed May 3,

In the construction of motors and other similar dynamo electric machines, the main supporting frame, so far as I am aware, has always heretofore been made of cast iron. The object of the present invention is to provide, instead of such a cast iron frame, one that is fabricated out of structural steel shapes, namely, one made of steel angle bars or channels suitably shaped and then welded together to form a unitary rigid frame. As a result, not only have I found it possible to provide a stronger and more dependable construction while at the same time greatly reducing the weight of such frame, but the cost is likewise greatly reduced, and owing to the greater modulus of elasticity which such steel structural elements possess over cast iron, consequential advantages are also achieved in other respects.

To the accomplishment of the foregoing and related ends, the invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, the annexed drawing and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting,however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing Fig. 1 is partly a side elevation and partly a central vertical section of a typical motor wherein my improved construction of. frame is incorporated; Fig. 2 is a side elevation and Fig.3 an end plan view of such frame by itself; Figs. 4 and 5 are transverse sections of such frame taken on the planes indicated by the lines 4-4 and 5-5, Fig. 3, respectively; Fig. 6 is a section corresponding with that of Fig. 4, but showing a modification in construction; and Fig. 7 is a plan view of the straight angle bar from which one of the component parts of such frame is fashioned.

The only parts in the motor assembly shown in Fig. 1, to which attention needbe directed in the present connection, are the stator 1 and the frame 2 from which such stator is supported in proper position about the rotor 3. As best shown in Figs. 2 and 3, the frame 2 includes, along with other parts presently to be mentioned, two similar 1924. Serial No. 710,840.

frame rings

4, 4, each of which is made a from a straight steelangle bar 5 (see Fig. 7), the one flange 5 of which is somewhat wider than the other flange 5". At the respective ends of the bar, said fiangeb -is beveledas shown at 5, so that when the bar is rolled into circular shape, the'beveled faces 5 will contact on a radial line. The

weld 6 is preferably effected by means of an electric arc, using an arc pencil ofsuitable metal to fill in any space that may be i the figures just referred to, as well as in Fig. 2, the frames are thus secured together with the flanges 5 directed inwardly, -i; e. towards each other, and in the caseof bars 7 the ends thereof are notched to interfit with these flanges, such bars being of the same width as flange 5 The bars 8, on the contrary, instead of being thus notched, lie

Wholly within the flanges 5, the inner edgeof such bar projecting slightly inwardly beyond the corresponding edges of flanges 5 Said

bars

7 and 8 constitutecross-tic bars, their ends which thus interfit with the rings 2 being permanently welded to the flanges of the latter, as shown in Figs. 4

and 6and also in Fig. 3, so that a unitary and substantially rigid structure is formed.

In addition to thus welding the cross tie bars to the rings 2, I also similarly weld in the angle formed between the

flanges

5 and 5 of the frame rings, at circumferentially spaced points thereabout, a series of nuts 9 through which pass the bolts 10 that are required to hold in place the plates that compose the stator 1.- The latter are further held in place by means of fiat rings 11 that are locked against the respective sides of said stator by retaining rings 12 of square cross-section fitting into notches 13 in the inner edges of the

bars

7 and 8,

all as shown in Fig. 1. Feet 14: on which.

the machine is designed to rest, are linally welded at suitable oppositely spaced points on the flange 5 of each ring i A frame thus made from structural steel shapes permanently welded together in the fashion described I have found is practically free from the danger of breakage experienced with cast iron, while at the same time it is both stronger and decidedly less bulky than any cast iron frame of equivalent strength. A consequential saving in cost is also achieved for not only, as heretofore pointed out, is a saving effected in weight of. metal en'iployed, it being necessary to use only one-third to one-half as many pounds to do the same work, but the steel employed will normally cost less than one-half as much per pound as cast iron. It will be understood, finally, that while I have described theframe rings that enter into my improved frame as being fabricated from steel angle bars, structural steel of other cross-sectional forms may be similarly used with the same or nearly equal advantage.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as re gards' the mechanism or steps herein disclosed, provided the means or steps stated by any of the following claims or the equivalent of such stated means or steps be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a dynamo electric machine,-the combination with the annular laminated stator; of a supporting frame therefor, said frame including twoend-rings, each made from an elongated structural steel member formed into a circle and having its ends Welded to gether, and cross-tie bars welded at their ends to said rings. respectively, said stator being secured to the inner faces of said crosstie bars.

2. In a dynamo electric machine, the combination With the annular laminated stator; of a supporting frame therefor, said frame including two end-rings, each made from an elongated structural steel member of angular cross-section formed into a circle and having its ends welded together, and crosstie bars Welded at their ends to said rings, respectively, said stator being secured to the inner faces of said cross-tie bars.

3. Ina dynamo electric machine, the combination with the annular laminated stator; of a supporting frame therefor, said frame including two end-rings, each made from a steel angle bar formed into a circle and having its ends welded together with one flange of said bar constituting a cylindrical portion and the other a flat inwardly directed portion of the end-ring, and cross-tic bars lying between such flat portions of the two end-rings and welded. at their ends to the latter, respectively, said stator being secured to the inner faces of said cross-tie bars.

4. In a dynamo electric machine, the combination with the annular laminated stator; of a supporting frame therefor, said frame including two end-rings, each made from a steel angle bar formed into a circle and having its ends welded together with one flange of said bar constituting a cylindrical portion and the other a'fla-t inwardly directed portion of the end-ring, such cylindrical portions of the two end-rings being directed inwardly, and cross-tie bars. lying between such flat portions of the two end rings and welded attheir ends to the latter, respectively, said stator being secured to the inner faces of said cross-tie bars.

Signed by me, this 1st day of May, 1924.

JAMES F. LINCOLN.